CVE-2021-43945 : What You Need to Know
Learn about CVE-2021-43945 affecting Atlassian Jira Server and Data Center. Find out how remote attackers can exploit the Stored Cross-Site Scripting (SXSS) vulnerability and effective mitigation strategies.
A Stored Cross-Site Scripting (SXSS) vulnerability in Atlassian Jira Server and Data Center allows remote attackers to inject malicious scripts.
Understanding CVE-2021-43945
The vulnerability in Atlassian Jira Server and Data Center versions prior to 8.20.3 can be exploited by attackers with Roadmaps Administrator permissions to execute arbitrary scripts.
What is CVE-2021-43945?
- It is a Stored Cross-Site Scripting (SXSS) vulnerability affecting Atlassian Jira Server and Data Center.
- Attackers with specific permissions can inject HTML or JavaScript via a vulnerable endpoint.
The Impact of CVE-2021-43945
- Remote attackers can exploit this vulnerability to inject harmful scripts into the application.
- Successful exploitation could lead to unauthorized access, data theft, or complete system compromise.
Technical Details of CVE-2021-43945
The technical aspects of the CVE-2021-43945 vulnerability in Atlassian Jira Server and Data Center.
Vulnerability Description
- Affected versions allow remote attackers to perform Stored Cross-Site Scripting (SXSS) by using a specific endpoint.
Affected Systems and Versions
- Products: Atlassian Jira Server, Jira Data Center
- Versions affected: Prior to 8.20.3
Exploitation Mechanism
- Exploitation involves injecting arbitrary HTML or JavaScript through the /rest/jpo/1.0/hierarchyConfiguration endpoint.
Mitigation and Prevention
Steps to take to mitigate the CVE-2021-43945 vulnerability in Atlassian Jira Server and Data Center.
Immediate Steps to Take
- Update Atlassian Jira Server and Data Center to version 8.20.3 or higher.
- Restrict Roadmaps Administrator permissions to trusted users.
- Regularly monitor for any unauthorized script injections.
Long-Term Security Practices
- Implement strict input validation mechanisms to prevent XSS attacks.
- Educate users on safe practices regarding executing scripts within the application.
Patching and Updates
- Stay informed about security updates from Atlassian and apply patches promptly to secure your systems.